PCDJ DEX software (version 3.4_rc) is a professional DJ software that allows users to mix and blend tracks with ease. The software features advanced beat-grid and key analysis tools, allowing for precise beat-matching and harmonious mixing. Users can also create and customize their own playlists, and utilize a variety of effects and filters to enhance their performances. Additionally, the software supports a range of DJ hardware controllers for a more tactile and hands-on experience.